Leland's body was assimilated by Control's consciousness.Well you could, but you shouldn't, because it's literally not. There's nothing to assimilate into here. I would rather words keep their meanings.
as·sim·i·late
/əˈsiməˌlāt/
verb
verb: assimilate; 3rd person present: assimilates; past tense: assimilated; past participle: assimilated; gerund or present participle: assimilating
- 1.
take in (information, ideas, or culture) and understand fully.
"Marie tried to assimilate the week's events"
- absorb and integrate (people, ideas, or culture) into a wider society or culture.
"pop trends are assimilated into the mainstream with alarming speed"
synonyms: subsume, incorporate, integrate, absorb, engulf, swallow up, take over, co-opt, naturalize, adopt, embrace, accept, admit;
rare acculturate
"many tribes disappeared, having been assimilated by the Russian or Turkic peoples"- become absorbed and integrated into a society or culture.
"the older generation had more trouble assimilating"- (of the body or any biological system) absorb and digest (food or nutrients).
"the sugars in the fruit are readily assimilated by the body"
synonyms: absorb, take in, acquire, pick up, grasp, comprehend, understand, learn, master;More
- 2.
cause (something) to resemble; liken.
"philosophers had assimilated thought to perception"
- come to resemble.
"the Churches assimilated to a certain cultural norm"- PHONETICS
make (a sound) more like another in the same or next word.